:root {
  color-scheme: light;
  --bg: #f1f1f1;
  --bg-elev: #e8e8e8;
  --bg-panel: #ffffff;
  --bg-panel-2: #f7f7f7;
  --header-bg: rgba(241, 241, 241, 0.92);
  --footer-bg: #e8e8e8;
  --inset: #ebebeb;
  --line: rgba(36, 48, 72, 0.12);
  --line-strong: rgba(36, 72, 140, 0.35);
  --cyan: #24488c;
  --cyan-2: #1a3568;
  --amber: #b45309;
  --amber-2: #d97706;
  --accent: #24488c;
  --green: #24488c;
  --text: #1c2433;
  --muted: #5b6575;
  --lead: #334155;
  --danger: #b91c1c;
  --shadow: 0 14px 40px rgba(28, 40, 60, 0.08);
  --glow-1: rgba(36, 72, 140, 0.06);
  --glow-2: rgba(180, 83, 9, 0.04);
  --grid-line: rgba(36, 72, 140, 0.05);
  --nav-hover: rgba(36, 72, 140, 0.1);
  --thumb-border: #f1f1f1;
  --code-bg: rgba(36, 72, 140, 0.08);
  --learn-line: rgba(36, 72, 140, 0.22);
  --on-accent: #ffffff;
  --radius: 16px;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 1180px;
  --header-h: 76px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-elev: #121a2e;
  --bg-panel: #162038;
  --bg-panel-2: #1c2944;
  --header-bg: rgba(11, 16, 32, 0.86);
  --footer-bg: #080d18;
  --inset: #0e1528;
  --line: rgba(130, 165, 230, 0.2);
  --line-strong: rgba(130, 165, 230, 0.42);
  --cyan: #8bb0f0;
  --cyan-2: #b7cff8;
  --amber: #f0b35a;
  --amber-2: #ffc978;
  --accent: #8bb0f0;
  --green: #8bb0f0;
  --text: #e4ebf7;
  --muted: #93a0b8;
  --lead: #c8d4ea;
  --danger: #ff7a88;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
  --glow-1: rgba(139, 176, 240, 0.12);
  --glow-2: rgba(240, 179, 90, 0.08);
  --grid-line: rgba(139, 176, 240, 0.05);
  --nav-hover: rgba(139, 176, 240, 0.12);
  --thumb-border: #0b1020;
  --code-bg: rgba(139, 176, 240, 0.1);
  --learn-line: rgba(139, 176, 240, 0.28);
  --on-accent: #0b1020;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(1200px 500px at 10% -10%, var(--glow-1), transparent 55%),
    radial-gradient(900px 400px at 100% 0%, var(--glow-2), transparent 50%);
  z-index: -1;
}

.site-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
  z-index: -1;
}

img { max-width: 100%; height: auto; }
a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--cyan-2); }

h1, h2, h3 { font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: clamp(2rem, 4vw, 3.25rem); margin: 0 0 0.6em; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.1rem; }

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  z-index: 100;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background: var(--cyan);
  color: var(--on-accent);
  padding: 8px 12px;
  border-radius: 8px;
}

.container {
  width: min(var(--max), calc(100% - 32px));
  margin-inline: auto;
}

.container.narrow { width: min(820px, calc(100% - 32px)); }

.eyebrow {
  display: inline-block;
  margin: 0 0 10px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.mono { font-family: var(--mono); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--header-bg);
  border-bottom: 1px solid var(--line);
}

/* Blur on a pseudo so it does not trap position:fixed / absolute children. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: -1;
  pointer-events: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
}

.brand-mark { color: var(--cyan); display: flex; }
.brand-text { display: flex; flex-direction: column; }
.brand-kicker {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.brand-name { font-weight: 600; font-size: 0.98rem; }

.site-nav .menu {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: block;
  color: var(--text);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.92rem;
}

.site-nav a:hover,
.site-nav .current-menu-item a {
  background: var(--nav-hover);
  color: var(--cyan-2);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: 10px;
  position: relative;
  padding: 0;
  cursor: pointer;
}

.nav-toggle-bar {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease, top 0.2s ease;
}

.nav-toggle-bar:nth-child(2) { top: 13px; }
.nav-toggle-bar:nth-child(3) { top: 20px; }
.nav-toggle-bar:nth-child(4) { top: 27px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  top: 20px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(4) {
  top: 20px;
  transform: rotate(-45deg);
}

/* Buttons */
.btn {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn.small { padding: 6px 10px; font-size: 0.8rem; font-weight: 500; }

.btn.ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn.amber {
  background: linear-gradient(180deg, var(--amber-2), var(--amber));
  color: var(--on-accent);
  border-color: transparent;
}

.btn.amber:hover { filter: brightness(1.06); }

.btn.cyan {
  background: linear-gradient(180deg, var(--cyan), var(--cyan-2));
  color: var(--on-accent);
  border-color: transparent;
}

.btn.cyan:hover { filter: brightness(1.06); }

.header-search {
  position: relative;
  display: flex;
  align-items: center;
}

.header-search-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--text);
  border-radius: 10px;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.header-search-toggle:hover,
.header-search.is-open .header-search-toggle {
  border-color: var(--line-strong);
  color: var(--cyan);
}

.header-search-form {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: min(420px, calc(100vw - 32px));
  padding: 10px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  z-index: 40;
}

.header-search-form[hidden] {
  display: none !important;
}

.header-search-form input[type="search"] {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
  font: inherit;
  font-family: var(--mono);
  font-size: 0.9rem;
  border-radius: 10px;
  padding: 10px 12px;
}

.header-search-form input[type="search"]:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

/* Inner-page hero (directory, learn, about) */
.page-hero {
  padding: 48px 0 20px;
}

.hero-lead { max-width: 62ch; color: var(--lead); font-size: 1.08rem; }

.page-hero.in-flow { padding: 48px 0 10px; }

/* Homepage bands */
.home {
  --home-glow: var(--glow-1);
}

.home::before {
  background:
    radial-gradient(900px 480px at 85% 0%, var(--glow-1), transparent 58%),
    radial-gradient(700px 380px at 0% 0%, var(--glow-2), transparent 50%);
}

.band {
  padding: 72px 0;
}

.band-banner {
  display: flex;
  align-items: center;
  padding: 40px 0 48px;
  box-sizing: border-box;
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

/* Banner photo on ::before only — .site-grid stays untouched. */
.band-banner.has-banner-image::before {
  content: "";
  position: absolute;
  inset: -12px;
  z-index: -2;
  background-image: var(--psd-banner-image);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  filter: blur(2px) saturate(1.05);
  transform: scale(1.02);
}

.band-banner.has-banner-image::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(
    105deg,
    rgba(12, 18, 32, 0.55) 0%,
    rgba(12, 18, 32, 0.38) 42%,
    rgba(12, 18, 32, 0.22) 100%
  );
}

.band-banner.has-banner-image .home-copy {
  color: #f4f7fb;
}

.band-banner.has-banner-image .home-copy .eyebrow {
  color: #9eb6e8;
}

.band-banner.has-banner-image .home-copy h1 {
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.35);
  font-size: clamp(1.65rem, 3.2vw, 2.45rem);
  max-width: 22ch;
  line-height: 1.18;
}

.band-banner.has-banner-image .home-copy .hero-lead {
  color: rgba(232, 238, 248, 0.92);
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.3);
}

.band-banner.has-banner-image .home-copy .btn.ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
  background: transparent;
}

.band-banner.has-banner-image .home-copy .btn.ghost:hover {
  border-color: #fff;
  color: #fff;
}

.band-banner.has-banner-image .home-copy .editorial-byline {
  border-top-color: rgba(255, 255, 255, 0.28);
  color: #f4f7fb;
}

.band-banner.has-banner-image .home-copy .editorial-byline-label,
.band-banner.has-banner-image .home-copy .editorial-byline-dates,
.band-banner.has-banner-image .home-copy .editorial-byline-dates span {
  color: rgba(190, 208, 240, 0.88);
}

.band-banner.has-banner-image .home-copy .editorial-byline-name,
.band-banner.has-banner-image .home-copy .editorial-byline-name .author,
.band-banner.has-banner-image .home-copy .editorial-byline-dates time {
  color: #fff;
}

.band-banner.has-banner-image .home-copy .editorial-byline-bio {
  color: rgba(226, 234, 248, 0.9);
}

.band-banner.has-banner-image .home-chain {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #d7e4ff;
}

.band-banner.has-banner-image .home-chain p {
  color: rgba(230, 236, 248, 0.85);
}

.band-banner.has-banner-image .home-residues {
  color: #d7e4ff;
}

.band-odd {
  background: var(--bg-elev);
  border-block: 1px solid var(--line);
}

.band-intro {
  max-width: 62ch;
  margin-bottom: 32px;
}

.band-intro h2 { margin: 0 0 12px; }
.band-intro p { color: var(--muted); margin: 0; }
.band-intro .home-cta { margin-top: 28px; }

.home-hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.home-copy h1 {
  max-width: 18ch;
  font-size: clamp(1.85rem, 3.6vw, 2.85rem);
}

.home-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.home-chain {
  background: linear-gradient(160deg, var(--code-bg), var(--inset));
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 18px 18px 14px;
  color: var(--cyan);
  position: relative;
  overflow: hidden;
}

.home-chain-live::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 20% 30%, var(--glow-1), transparent 40%),
    radial-gradient(circle at 80% 70%, var(--glow-2), transparent 42%);
  animation: chain-haze 8s ease-in-out infinite alternate;
  pointer-events: none;
}

.home-chain svg { width: 100%; height: auto; display: block; position: relative; z-index: 1; }
.home-chain svg .node { fill: var(--cyan); }
.home-chain svg .scan-dot { fill: var(--amber); }
.chain-end-label {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.chain-path-dash {
  animation: chain-dash 2.8s linear infinite;
  opacity: 0.85;
}

.chain-nodes .node {
  transform-box: fill-box;
  transform-origin: center;
  animation: node-pulse 2.4s ease-in-out infinite;
}

.chain-nodes .n2 { animation-delay: 0.2s; }
.chain-nodes .n3 { animation-delay: 0.4s; }
.chain-nodes .n4 { animation-delay: 0.6s; }
.chain-nodes .n5 { animation-delay: 0.8s; }
.chain-nodes .n6 { animation-delay: 1s; }

.home-residues {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  list-style: none;
  margin: 4px 0 8px;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan-2);
  letter-spacing: 0.12em;
  position: relative;
  z-index: 1;
}

.home-residues li {
  animation: residue-glow 3.6s ease-in-out infinite;
}

.home-residues li:nth-child(2) { animation-delay: 0.25s; }
.home-residues li:nth-child(3) { animation-delay: 0.5s; }
.home-residues li:nth-child(4) { animation-delay: 0.75s; }
.home-residues li:nth-child(5) { animation-delay: 1s; }
.home-residues li:nth-child(6) { animation-delay: 1.25s; }

.home-chain p { margin: 0; color: var(--muted); font-size: 0.78rem; position: relative; z-index: 1; }

@keyframes chain-dash {
  to { stroke-dashoffset: -88; }
}

@keyframes node-pulse {
  0%, 100% { opacity: 0.75; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.15); }
}

@keyframes residue-glow {
  0%, 100% { opacity: 0.55; }
  40% { opacity: 1; }
}

@keyframes chain-haze {
  from { transform: translate3d(-2%, -1%, 0) scale(1); opacity: 0.7; }
  to { transform: translate3d(3%, 2%, 0) scale(1.06); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .chain-path-dash,
  .chain-nodes .node,
  .home-residues li,
  .home-chain-live::before,
  .scan-dot,
  .home-card,
  a.home-card {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}

.feature-row {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: center;
}

.feature-row.reverse {
  grid-template-columns: 0.95fr 1.05fr;
}

.feature-row.reverse .feature-figure { order: 2; }
.feature-row.reverse .feature-copy { order: 1; }

.feature-copy h2 {
  margin-top: 0;
  letter-spacing: -0.02em;
}
.feature-copy > p { color: var(--muted); max-width: 38ch; }
.feature-copy .home-cta { margin-top: 22px; }

.feature-figure {
  margin: 0;
  color: var(--cyan);
}

.feature-figure.feature-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: 0 18px 44px rgba(28, 40, 60, 0.08);
  overflow: hidden;
  padding: 8px;
}

.feature-figure svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 22px;
  background: transparent;
  box-shadow: none;
}

.fig-bg { fill: var(--bg-panel); stroke: none; }
.fig-label { fill: var(--muted); font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; }
.fig-code { fill: var(--text); font-family: var(--mono); font-size: 20px; font-weight: 600; }
.fig-code.muted { fill: var(--muted); letter-spacing: 0.18em; }
.fig-aa { fill: var(--cyan); font-family: var(--mono); font-size: 20px; font-weight: 600; }
.fig-small { fill: var(--muted); font-family: var(--font); font-size: 13px; }
.fig-small.tight { font-family: var(--mono); font-size: 12px; letter-spacing: 0.02em; }
.fig-caption { fill: var(--muted); font-family: var(--font); font-size: 14px; }
.fig-ring {
  fill: color-mix(in srgb, var(--cyan) 5%, var(--bg-panel));
  stroke: var(--cyan);
  stroke-width: 2.25;
}
.fig-bond { stroke: var(--cyan); stroke-width: 2.75; fill: none; stroke-linecap: round; }
.fig-bond.thick { stroke-width: 3.25; }
.fig-dot { fill: var(--cyan); }
.fig-divider { stroke: var(--line); stroke-width: 1; }
.fig-s { stroke: var(--amber); stroke-width: 2.75; fill: none; stroke-linecap: round; }
.fig-s-cap { fill: var(--amber); }
.fig-chip {
  fill: color-mix(in srgb, var(--cyan) 7%, var(--bg-panel));
  stroke: var(--cyan);
  stroke-width: 1.6;
}
.fig-chip.soft {
  fill: var(--bg-panel);
  stroke: color-mix(in srgb, var(--cyan) 28%, var(--line));
}
.fig-chip.accent {
  fill: color-mix(in srgb, var(--amber) 12%, var(--bg-panel));
  stroke: var(--amber);
}
.fig-badge {
  fill: color-mix(in srgb, var(--cyan) 8%, var(--bg-panel));
  stroke: var(--line);
  stroke-width: 1;
}
.fig-badge.warm {
  fill: color-mix(in srgb, var(--amber) 12%, var(--bg-panel));
}
.fig-badge-dot { fill: var(--cyan); }
.fig-badge-dot.accent { fill: var(--amber); }
.fig-badge-text {
  fill: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
}

.related-panel {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 28px;
  align-items: start;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow);
}

.related-panel h2 { margin-top: 0; }
.related-panel > div > p { color: var(--muted); }

.related-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.related-notes li {
  background: var(--inset);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Shared white cards — Steps, Notation, Fields */
.home-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px 20px;
  box-shadow: 0 8px 24px rgba(28, 40, 60, 0.04);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

a.home-card {
  text-decoration: none;
  color: inherit;
}

a.home-card:hover,
.home-card:hover {
  border-color: color-mix(in srgb, var(--cyan) 35%, var(--line));
  box-shadow: 0 12px 28px rgba(28, 40, 60, 0.08);
  transform: translateY(-1px);
}

.field-grid,
.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.field-grid h3,
.step-grid h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--text);
}

.field-grid p,
.step-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.home-card-index,
.step-grid .home-card-index {
  display: inline-block;
  font-family: var(--mono);
  color: var(--cyan);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.home-learn {
  display: grid;
  grid-template-columns: 0.85fr 1.35fr;
  gap: 32px;
  align-items: start;
}

.home-learn-copy h2 {
  margin-top: 0;
  letter-spacing: -0.02em;
}
.home-learn-copy > p { color: var(--muted); max-width: 36ch; }
.home-learn-copy .home-cta { margin-top: 22px; }

.learn-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.learn-card h3 {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 1.02rem;
}

.learn-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

/* Search panel — no outer card; cards live on filters + results */
.search-panel {
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  margin-bottom: 56px;
}

.search-panel-head h2 { margin: 0 0 8px; }
.search-panel-head p { color: var(--muted); margin: 0 0 22px; }

.search-field {
  display: block;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.search-field span,
.select-field span,
.field-label,
.range-block .field-label,
.mods-field .field-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.search-field input,
.select-field select,
.range-values input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
  font: inherit;
  border-radius: 12px;
  padding: 12px 14px;
}

.search-field input {
  font-family: var(--mono);
  font-size: 1rem;
  padding: 16px 18px;
}

.search-field input:focus,
.select-field select:focus,
.range-values input:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 1px;
}

.filter-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.8fr;
  gap: 18px;
  margin-top: 20px;
}

.range-block,
.select-field,
.mods-field {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px 16px;
  margin: 0;
  box-shadow: var(--shadow);
}

.range-values {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.range-values input { font-family: var(--mono); font-size: 0.85rem; }
.range-values span { color: var(--muted); }

.dual-range {
  position: relative;
  height: 28px;
}

.dual-range input[type="range"] {
  position: absolute;
  inset: 10px 0 auto;
  width: 100%;
  background: none;
  pointer-events: none;
  appearance: none;
}

.dual-range input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--line);
  border-radius: 99px;
}

.dual-range input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  pointer-events: all;
  width: 16px;
  height: 16px;
  margin-top: -6px;
  border-radius: 50%;
  background: var(--cyan);
  border: 2px solid var(--thumb-border);
  cursor: pointer;
}

.dual-range input[type="range"]::-moz-range-track {
  height: 4px;
  background: var(--line);
}

.dual-range input[type="range"]::-moz-range-thumb {
  pointer-events: all;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cyan);
  border: 2px solid var(--thumb-border);
}

.mods-list {
  display: grid;
  gap: 8px;
  max-height: 160px;
  overflow: auto;
}

.mods-list label {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
}

.mods-list input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  margin: 0;
  flex: 0 0 auto;
  accent-color: var(--cyan);
}

.filter-actions {
  display: flex;
  justify-content: flex-start;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding: 4px 0;
}

.results-meta {
  margin: 28px 0 14px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.compound-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.compound-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0 0 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  overflow: hidden;
}

.compound-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.card-media {
  display: block;
  margin: 0;
  height: 112px;
  aspect-ratio: auto;
  background: var(--inset);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-media.is-empty {
  display: grid;
  place-items: center;
  background:
    linear-gradient(145deg, rgba(36, 72, 140, 0.08), transparent 55%),
    var(--inset);
}

.card-media-fallback {
  font-family: var(--mono);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--cyan);
  opacity: 0.55;
  line-height: 1;
}

.compound-card header,
.compound-card .card-seq,
.compound-card .card-meta,
.compound-card .card-link {
  margin-left: 18px;
  margin-right: 18px;
}

.compound-card header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
  margin-top: 14px;
}

.compound-card h3 { margin: 0; font-size: 1.05rem; line-height: 1.3; }
.compound-card h3 a { color: var(--text); text-decoration: none; }
.compound-card h3 a:hover { color: var(--cyan); }

.card-seq {
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--cyan-2);
  background: transparent;
  border: 0;
  border-left: 3px solid var(--line-strong);
  border-radius: 0;
  padding: 2px 0 2px 12px;
  margin: 0;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  min-height: 0;
}

.card-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.card-meta div { margin: 0; }
.card-meta dt { color: var(--muted); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em; }
.card-meta dd { margin: 2px 0 0; font-family: var(--mono); font-size: 0.86rem; color: var(--text); }

.card-link {
  margin-top: auto;
  align-self: flex-start;
  color: var(--amber);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

.card-link:hover { color: var(--amber-2); }

.tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 8px;
  color: var(--muted);
}

.tag.cyan { color: var(--cyan); border-color: var(--line-strong); }

.compound-grid.is-loading {
  opacity: 0.55;
  pointer-events: none;
}

.psd-pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
  margin: 28px 0 8px;
}

.psd-pagination[hidden] { display: none !important; }

.page-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  min-width: 40px;
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.page-btn:hover:not(:disabled):not(.is-current) {
  border-color: var(--line-strong);
  color: var(--cyan);
}

.page-btn.is-current {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--on-accent);
  cursor: default;
}

.page-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.page-gap {
  color: var(--muted);
  padding: 0 2px;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 32px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 16px;
}

/* Learn strip */
.learn-strip {
  padding: 10px 0 80px;
}

.learn-strip .container {
  display: grid;
  grid-template-columns: 0.8fr 1.4fr;
  gap: 24px;
  align-items: start;
}

/* Record */
.crumbs {
  display: flex;
  gap: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  margin: 28px 0 18px;
}

.record { padding-bottom: 72px; }
.record-header h1 { margin-bottom: 8px; }
.synonyms { color: var(--muted); margin-top: 0; }
.record-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }

.sequence-panel.has-media {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.sequence-media {
  margin: 0;
  width: 160px;
  height: 160px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--inset);
  border: 1px solid var(--line);
  flex-shrink: 0;
}

.sequence-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.sequence-body {
  min-width: 0;
}

.sequence-panel .panel-label-row {
  margin-top: 0;
}

.record-panel,
.stat {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  margin: 16px 0;
}

.panel-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.sequence-display {
  font-size: 1.05rem;
  color: var(--cyan-2);
  margin-bottom: 10px;
}

.sequence-mono {
  display: inline-block;
  width: fit-content;
  max-width: 100%;
  box-sizing: border-box;
  font-family: var(--mono);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  background: var(--inset);
  border-radius: 12px;
  padding: 14px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}

.record-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.stat { margin: 0; }
.stat span { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; }
.stat strong { display: block; margin-top: 8px; font-size: 1.05rem; }
.stat em { color: var(--muted); font-style: normal; font-size: 0.8rem; }
.stat a { color: var(--cyan-2); }

.field-key {
  margin: 4px 0 20px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
  max-width: 72ch;
}

.field-key a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ref-list { padding-left: 18px; }
.ref-list li { margin: 8px 0; }
.record-export { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }

/* Learn / prose */
.learn-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 36px;
  padding: 10px 0 80px;
}

.learn-nav {
  position: sticky;
  top: calc(var(--header-h) + 10px);
  align-self: start;
  background: var(--bg-elev);
  border: 1px solid var(--learn-line);
  border-radius: 16px;
  padding: 16px;
}

.learn-nav ul { list-style: none; margin: 0; padding: 0; }
.learn-nav a {
  display: block;
  color: var(--text);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.92rem;
}

.learn-nav .is-current a,
.learn-nav a:hover { background: var(--code-bg); color: var(--cyan); }

.prose { color: var(--text); }
.prose .lead { font-size: 1.15rem; color: var(--lead); }
.prose h2 { margin-top: 1.6em; }
.prose h3 {
  margin: 1.35em 0 0.45em;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.prose p { margin: 0 0 0.95em; }
.prose strong { color: var(--text); font-weight: 650; }
.prose ul,
.prose ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
}
.prose li { margin: 0.25em 0; }
.prose .table-wrap {
  margin: 1em 0 1.25em;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.45em;
  border-radius: 6px;
}

/* Gutenberg tables — light rounded card, thin borders (no dark header bar) */
.prose .wp-block-table,
.record-panel.prose .wp-block-table {
  margin: 1.1em 0 1.35em;
  overflow: hidden;
  border: 1px solid var(--line) !important;
  border-radius: 12px;
  background: var(--bg-panel);
  box-shadow: none;
}

.prose .wp-block-table table,
.record-panel.prose .wp-block-table table {
  width: 100%;
  border-collapse: collapse !important;
  border-spacing: 0 !important;
  font-size: 0.92rem;
  margin: 0;
  border: none !important;
  background: transparent;
}

.prose .wp-block-table thead,
.record-panel.prose .wp-block-table thead {
  border: none !important;
  box-shadow: none !important;
}

.prose .wp-block-table thead th,
.record-panel.prose .wp-block-table thead th {
  background: color-mix(in srgb, var(--cyan) 7%, var(--bg-panel)) !important;
  color: var(--cyan) !important;
  font-weight: 600;
  border: none !important;
  border-bottom: 1px solid var(--line) !important;
  border-right: 1px solid var(--line) !important;
}

.prose .wp-block-table thead th:last-child,
.record-panel.prose .wp-block-table thead th:last-child {
  border-right: none !important;
}

.prose .wp-block-table th,
.prose .wp-block-table td,
.record-panel.prose .wp-block-table th,
.record-panel.prose .wp-block-table td {
  border: none !important;
  border-bottom: 1px solid var(--line) !important;
  border-right: 1px solid var(--line) !important;
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  background: transparent;
}

.prose .wp-block-table th:last-child,
.prose .wp-block-table td:last-child,
.record-panel.prose .wp-block-table th:last-child,
.record-panel.prose .wp-block-table td:last-child {
  border-right: none !important;
}

.prose .wp-block-table tr:last-child td,
.record-panel.prose .wp-block-table tr:last-child td {
  border-bottom: none !important;
}

.prose .wp-block-table tbody tr:nth-child(even),
.record-panel.prose .wp-block-table tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--cyan) 3.5%, var(--bg-panel));
}

.prose .wp-block-table tbody tr:nth-child(odd),
.record-panel.prose .wp-block-table tbody tr:nth-child(odd) {
  background: var(--bg-panel);
}

.prose .wp-block-table figcaption,
.record-panel.prose .wp-block-table figcaption {
  display: none;
}

/* Gutenberg quotes — rounded callout with left accent */
.prose .wp-block-quote,
.record-panel.prose .wp-block-quote,
.prose blockquote {
  margin: 1.1em 0;
  padding: 14px 16px 14px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: var(--code-bg);
  border-radius: 12px;
  color: var(--lead);
  box-shadow: none;
}

.prose .wp-block-quote p,
.record-panel.prose .wp-block-quote p,
.prose blockquote p {
  margin: 0;
}

.prose .wp-block-quote cite,
.record-panel.prose .wp-block-quote cite {
  display: none;
}

.table-wrap { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
}

.data-table th { color: var(--cyan); font-weight: 600; }
.data-table tbody tr:hover { background: var(--code-bg); }

.plain-page,
.about-page { padding-bottom: 72px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--footer-bg);
  padding: 48px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr 1fr 0.7fr;
  gap: 32px 40px;
  padding-bottom: 36px;
}

.footer-brand {
  display: grid;
  gap: 14px;
  align-content: start;
}

.footer-logo {
  color: var(--text);
  text-decoration: none;
}

.footer-logo .brand-name { font-size: 1.05rem; }

.footer-brand > p { color: var(--muted); margin: 0; max-width: 38ch; }

.footer-heading {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.footer-col a {
  color: var(--text);
  text-decoration: none;
}

.footer-col a:hover { color: var(--cyan); }

.footer-bar {
  border-top: 1px solid var(--line);
  padding: 16px 0 22px;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-bar p { margin: 0; }

.footer-bar .footer-disclosure,
.footer-bar .footer-contact {
  margin-top: 8px;
  max-width: 80ch;
}

.footer-bar .footer-contact a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.editorial-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  align-items: flex-start;
  justify-content: space-between;
  margin: 18px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  max-width: 62ch;
}

.band-banner .editorial-byline {
  border-top-color: color-mix(in srgb, currentColor 22%, transparent);
  color: inherit;
}

.editorial-byline-label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.editorial-byline-name {
  margin: 4px 0 0;
  font-weight: 600;
}

.editorial-byline-name .author {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.editorial-byline-bio {
  margin: 6px 0 0;
  font-size: 0.92rem;
  color: var(--lead);
  max-width: 52ch;
}

.editorial-byline-dates {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: 0.86rem;
  color: var(--muted);
}

.editorial-byline-dates span {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.editorial-byline-dates time {
  color: var(--text);
}

.record-header .editorial-byline {
  max-width: none;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--cyan);
  color: var(--on-accent);
  box-shadow: var(--shadow);
  cursor: pointer;
  display: grid;
  place-items: center;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.15s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--cyan-2);
}

.back-to-top[hidden] {
  display: none !important;
}

.admin-bar .back-to-top {
  bottom: 52px;
}

.admin-bar .site-header { top: 32px; }

@media (max-width: 960px) {
  .filter-grid,
  .record-grid,
  .learn-strip .container,
  .home-hero,
  .home-learn,
  .feature-row,
  .feature-row.reverse,
  .related-panel,
  .field-grid,
  .step-grid,
  .learn-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-row.reverse .feature-figure,
  .feature-row.reverse .feature-copy { order: initial; }

  .band-banner {
    padding: 28px 0 40px;
  }

  .compound-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-cards { grid-template-columns: 1fr; }

  .sequence-panel.has-media {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 14px;
  }

  .sequence-media {
    width: 120px;
    height: 120px;
  }

  .nav-toggle { display: block; }

  .header-search-form {
    position: fixed;
    top: var(--header-h);
    left: 12px;
    right: 12px;
    min-width: 0;
  }

  .site-nav {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 50;
    width: 100%;
    height: auto;
    margin: 0;
    background: var(--bg-panel);
    border: 0;
    border-top: 1px solid var(--line);
    padding: 12px 20px 32px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .site-nav.is-open { display: block; }

  .site-nav .menu {
    flex-direction: column;
    gap: 8px;
    width: 100%;
    max-width: none;
  }

  .site-nav .menu > li {
    width: 100%;
  }

  .site-nav a {
    display: block;
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 1.05rem;
  }

  body.nav-open {
    overflow: hidden;
  }

  .admin-bar .site-nav {
    top: calc(var(--header-h) + 32px);
  }

  .learn-nav { position: static; }
}

@media (max-width: 782px) {
  .admin-bar .site-header { top: 46px; }

  .admin-bar .site-nav {
    top: calc(var(--header-h) + 46px);
  }
}

@media (max-width: 640px) {
  .compound-grid { grid-template-columns: 1fr; }

  .sequence-panel.has-media {
    grid-template-columns: 1fr;
  }

  .sequence-media {
    width: 112px;
    height: 112px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .back-to-top { transition: none; }
}

@media print {
  .site-header,
  .site-footer,
  .site-grid,
  .record-export,
  .nav-toggle,
  .back-to-top { display: none !important; }
  body { background: #fff; color: #111; }
  .record-panel, .stat { border-color: #ccc; background: #fff; }
}